JP2006275040A - Variable displacement rotary compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To firmly fix a clutch pin on a rotary shaft in a variable displacement rotary compressor. <P>SOLUTION: This compressor is provided with a first and a second compression chamber having different capacities, a rotary shaft, a first and a second eccentric bushing arranged on an outer circumference surface of the rotary shaft, a slot formed between the first and the second eccentric busings, a clutch pin connected to a clutch hole formed on the rotary shaft in a radial direction, and a fixed pin formed on the rotary shaft in a circumference direction and joined on a side surface of the clutch pin through a fixing hole communicating to the clutch hole. A groove having a fixed width is formed on a rear stage part of the clutch pin and a rear stage part of the fixing pin is fitted and joined to the groove in the rotary shaft. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a variable displacement rotary compressor, and more specifically, a variable displacement rotary compressor in which a clutch pin that transmits rotational force of a rotary shaft to two eccentric bushes is prevented from being detached from the rotary shaft due to repeated impacts. About.

  Generally, a cooling device that cools a specific space using a cooling cycle, such as an air conditioner and a refrigerator, includes a compressor for compressing a gas refrigerant. The cooling capacity of this type of cooling device is usually determined by the compression capacity of the compressor. Therefore, if the compression capacity of the compressor is configured to be variable, the cooling device is optimally controlled according to the surrounding environment, Energy saving is achieved.

  Accordingly, the present applicant has filed a variable displacement rotary compressor having an eccentric device that can vary the capacity so that the compression operation is selectively performed in either one of the two compression chambers having different internal volumes. (See Patent Document 1).

  The eccentric device includes a rotation shaft that passes through each compression chamber, two eccentric cams provided so as to protrude from the outer surface of the rotation shaft, and two eccentric bushes that are rotatably disposed on the outer surface of each eccentric cam. , According to the rotation direction of the rotation shaft of the two rollers that are rotatably disposed on the outer surface of each eccentric bush and compress the gas refrigerant, any one eccentric bush is switched from the center line of the rotation shaft to the eccentric position, The other eccentric bush includes a clutch pin that switches to a concentric position with the center line of the rotating shaft.

  In the conventional variable displacement rotary compressor configured as described above, when the rotation shaft rotates in the forward direction or the reverse direction, the eccentric device performs the compression operation only in one of the two compression chambers having different inner volumes. As a result, the compression capacity is varied.

However, in such a conventional variable displacement rotary compressor, the clutch pin protruding from the rotating shaft moves in the forward direction or the reverse direction in order to vary the capacity within a slot formed between the two eccentric bushes. When this happens, it will collide with both ends of the slot, and due to the impact caused by such repeated collision of the clutch pin, the clutch pin will not be fixed at the original position on the rotating shaft, causing noise and rotating. There is a problem that the compressor comes off from the shaft, leading to the operation stop of the compressor.
Republic of Korea Published Patent Publication No. 2004-0086559

  The present invention is to solve the above-described problems of the prior art, and an object of the present invention is to provide a variable displacement rotary compressor in which a clutch pin is firmly fixed to a rotary shaft.

  In order to achieve the above object, a variable displacement rotary compressor according to the present invention includes first and second compression chambers having different internal volumes, a rotation shaft that passes through the first and second compression chambers, and the rotation First and second eccentric bushes disposed on the outer peripheral surface of the shaft, a slot formed between the first and second eccentric bushes, a clutch pin protruding from the rotating shaft and disposed in the slot, And a fixing pin that is coupled to a side surface of the clutch pin inside the rotation shaft to firmly fix the clutch pin.

  The rotation shaft includes a clutch hole formed in a radial direction and a fixing hole formed in a circumferential direction and communicating with the clutch hole, and the clutch pin and the fixing pin are inserted into the clutch hole and the fixing hole, respectively. The fixing pin is coupled to the side surface of the clutch pin.

  A groove having a constant width is formed in the rear stage portion of the clutch pin, and the rear end portion of the fixed pin is fitted into the groove inside the rotating shaft and coupled.

  The clutch hole and the fixing hole are formed so as to be orthogonal to each other inside the rotating shaft, and the fixing pin fixes the clutch pin more firmly.

  The clutch pin has a size larger than the clutch hole, and is coupled to the clutch hole by a press-fitting method.

  The fixing pin and the fixing hole are threaded, and the fixing pin is screwed to the fixing hole.

  The capacity variable rotary compressor of the present invention has a structure in which the clutch pin is firmly coupled to the rotating shaft by the fixed pin, and the clutch pin is firmly fixed to the rotating shaft even if vibration and impact are repeatedly transmitted to the clutch pin. Since the state fixed to is maintained, it is possible to stably operate and to be advantageous for maintenance.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a longitudinal sectional view showing an outline of the internal structure of a variable displacement rotary compressor according to the present invention. As shown in FIG. 1, the variable displacement rotary compressor according to the present invention is provided inside a hermetic container 10 and compresses a gas by receiving the rotational force of the drive unit 20 that generates a rotational force and the drive unit 20. And a compression unit 30.

  The drive unit 20 includes a cylindrical stator 22 provided inside the hermetic container 10, a rotor 23 provided rotatably inside the stator 22, and a central portion of the rotor 23. 23 and a rotating shaft 21 that rotates in the forward direction (for example, counterclockwise direction) or the reverse direction (for example, clockwise direction).

  The compression unit 30 is disposed at the upper and lower ends of the cylindrical housing 33 in which the first compression chamber 31 and the second compression chamber 32 having different inner volumes at the upper part and the lower part are provided. The first flange 35 and the second flange 36 that rotatably support the valve 21 and a partition that is disposed between the first compression chamber 31 and the second compression chamber 32 and partitions the first compression chamber 31 and the second compression chamber 32 from each other. And a plate 34.

  Since the first compression chamber 31 is formed higher than the second compression chamber 32, the internal volume of the first compression chamber 31 is larger than the internal volume of the second compression chamber 32, and thereby the rotation according to the present invention. The compressor has a variable capacity. Of course, the capacity variable rotary compressor of the present invention may have a structure in which the second compression chamber 32 is larger than the first compression chamber 31.

  In the first compression chamber 31 and the second compression chamber 32, a compression operation is selectively performed only in one of the first compression chamber 31 and the second compression chamber 32 according to the rotation direction of the rotary shaft 21. An eccentric device 40 is arranged to be performed.

  The first compression chamber 31 and the second compression chamber 32 are respectively provided with a first roller 37 and a second roller 38 that are rotatably arranged on the outer peripheral surface of the eccentric device 40, and the housing 33 has the first compression chamber 31. The first and second suction ports 63 and 64 and the first and second discharge ports 65 and 66 (see FIGS. 5 and 7) are formed so as to communicate with the second compression chamber 32, respectively.

  A first vane 61 is disposed between the first suction port 63 and the first discharge port 65 in a radial direction in close contact with the first roller 37 by a support spring 61a (see FIG. 5). A second vane 62 is disposed between the second suction port 64 and the second discharge port 66 in a radial direction in close contact with the second roller 38 by a support spring 62a (see FIG. 7).

  Further, the outlet pipe 69a of the accumulator 69 that separates the liquid refrigerant and allows only the gas refrigerant to flow into the compressor is sucked into the first and second suction ports 63 and 64 formed in the housing 33 for compression operation. A flow path switching device 70 is provided to selectively open and close the suction flow paths 67 and 68 so that the gas refrigerant is supplied only to the mouth. Inside the flow path switching device 70, a bubble device 71 that operates due to a pressure difference between a suction flow path 67 connected to the first suction port 63 and a suction flow path 68 connected to the second suction port 64 is lateral. It is arranged to be movable.

  FIG. 2 is an exploded perspective view showing the eccentric device 40 and the rotating shaft 21, and FIGS. 3 and 4 are partially enlarged views showing a structure in which the clutch pin is coupled to the rotating shaft 21.

  Referring to FIG. 2, the eccentric device 40 includes a first eccentric cam 41, a second eccentric cam 42, and a first eccentric shaft provided at positions corresponding to the first compression chamber 31 and the second compression chamber 32, respectively, on the rotation shaft 21. A first eccentric bush 51 and a second eccentric bush 52 disposed on the outer peripheral surfaces of the cam 41 and the second eccentric cam 42, respectively, a clutch pin 80 installed between the first eccentric cam 41 and the second eccentric cam 42, The first eccentric bushing 51 and the second eccentric bushing 52 are formed with a certain length, and the clutch pin 80 is applied according to the forward or reverse rotation of the rotary shaft 21 so that the clutch operation can be performed. A slot 53 is provided.

  The first eccentric cam 41 and the second eccentric cam 42 are integrally projected from the outer peripheral surface of the rotary shaft 21 in the lateral direction, and surround the outer surfaces of the first and second eccentric cams 41 and 42, respectively. The bushes 51 and 52 are formed so as to be eccentric in directions facing each other. That is, the first and second eccentric bushes 51 and 52 are formed asymmetrically with respect to the rotating shaft 21.

  The first eccentric bush 51 and the second eccentric bush 52 are integrally connected via a connecting portion 54 formed between them, and a slot 53 into which the clutch pin 80 is inserted and turned is provided. It is formed along the circumferential direction of the connecting portion 54. Therefore, the first and second eccentric bushes 51 and 52 are configured such that when the clutch pin 80 is engaged with the first end 53a or the second end 53b of the slot 53 while rotating along the slot 53, the clutch pin 80 While being rotated together by 80, it is switched to a concentric position or a maximum eccentric position with respect to the rotating shaft 21. That is, since the first and second eccentric bushes 51 and 52 are arranged opposite to each other so as to be eccentric to each other, when one of them is in the concentric position, the remaining one is in the maximum eccentric position. Come to be.

  Even if the variable displacement rotary compressor of the present invention is operated for a long time, the clutch pin 80 is fixed inside the rotary shaft 21 so as to be firmly fixed so that the clutch pin 80 is not idled or removed by the rotary shaft 21. 90.

  The clutch pin 80 is inserted into a clutch hole 85 formed between the first eccentric cam 41 and the second eccentric cam 42 in the rotary shaft 21 so as to protrude from the rotary shaft 21, and the clutch pin 80 is inserted into the clutch hole 85. The fixing pin 90 that is firmly fixed so as not to be disengaged is inserted into a fixing hole 95 that is separated from the clutch hole 85 in the rotating shaft 21.

  Referring to FIG. 3, the clutch hole 85 is formed in the radial direction from the outer surface of the rotating shaft 21 toward the center of the rotating shaft 21, and the fixing hole 95 is formed in the circumferential direction from the outer surface of the rotating shaft 21. The clutch 21 is communicated with the inside of the shaft 21.

  The fixing hole 95 is formed so as to be substantially orthogonal to the clutch hole 85, and thus the fixing pin 90 is also coupled in a shape orthogonal to the side surface of the clutch pin 80. Therefore, it is possible to effectively prevent the clutch pin 80 from being detached from the clutch hole 85 due to an impact caused by the collision of the clutch pin 80 with the first and second end portions 53a and 53b of the slot 53 repeatedly. become.

  The clutch pin 80 includes a head 81 that is locked to the slot 53, and a body portion 82 that extends from the head 81 and is inserted into the clutch hole 85 of the rotary shaft 21. A groove 83 having a constant width is formed.

  The head portion 81 has a smaller diameter than the body portion 82, and the diameter of the body portion 82 is substantially the same as the diameter of the clutch hole 85, so that the body portion 82 of the clutch pin 80 is press-fitted into the clutch hole 85. Then, the head 81 protrudes from the rotating shaft 21 and functions as a clutch in the slot 53. The body portion 82 of the clutch pin 80 has a diameter such that the clutch pin 80 is press-fitted and fixed to the clutch hole 82.

  The diameter of the body portion 82 of the clutch pin 80 and the diameter of the clutch hole 85 are made substantially the same size, and a thread is cut into the body portion 82 and the clutch hole 85 so that the clutch pin 80 is screwed into the clutch hole 85 by a screw coupling method. It is also possible to tighten.

  The fixing pin 90 includes a head 91 having a wrench groove formed on the front surface, a body 92 extending from the head 91 and inserted into the fixing hole 95, and a groove of the clutch pin 80 extending from the body 92. 83 comprises a coupling portion 93 fitted into 83.

  The diameter of the head 91 is formed larger than the diameter of the fixing hole 95, the diameter of the trunk portion 92 is formed to be the same size as that of the fixing hole 95, and the diameter of the coupling portion 93 is smaller than that of the trunk portion 92. Thus, it is formed with a size equal to the width of the groove 83 of the clutch pin 80. The body portion 92 and the fixing hole 95 are threaded and are coupled to each other by screws.

  Therefore, in a state where the first and second eccentric cams 41 and 42 are disposed in the first and second eccentric bushes 51 and 52, respectively, the clutch pin 80 is press-fitted into the clutch hole 85, and the clutch pin 80 is attached to the rotary shaft 21. When the fixing pin 90 is tightened into the fixing hole 95 after the connection, the body portion 92 of the fixing pin 90 is fixed to the fixing hole 95 by screw connection as shown in FIG. The clutch pin 80 is firmly fixed to the rotating shaft 21 by fitting the portion 93 into the groove 83 of the clutch pin 80. On the other hand, in a state where the fixing pin 90 is coupled to the side surface of the clutch pin 80 as described above, the fixing pin 90 does not protrude from the rotating shaft 21.

  Hereinafter, the operation of selectively compressing the gas refrigerant in the first compression chamber or the second compression chamber by the eccentric device configured as described above will be described with reference to FIGS. 5 to 8.

  Referring to FIGS. 5 and 6, when the rotating shaft 21 rotates forward (counterclockwise in FIGS. 5 and 6), the clutch pin 80 protruding from the rotating shaft 21 rotates along the slot 53 while rotating the slot 53. The first and second eccentric bushes 51 and 52 are rotated together with the rotary shaft 21.

  Thus, when the clutch pin 80 rotates with the first end 53a of the slot 53 being engaged, the first eccentric bush 51 is positioned to the maximum eccentric from the center of the rotating shaft 21, as shown in FIG. Since the first roller 37 rotates in the first compression chamber 31 in contact with the inner peripheral surface of the housing 33, the first compression chamber 31 performs a compression operation.

  On the other hand, as shown in FIG. 6, the second eccentric bush 52 that is eccentric to the opposite side of the first eccentric bush 51 is switched to a position that is concentric with the center of the rotating shaft 21, and the second roller 38 is second compressed. Since the chamber 32 is idly rotated with a certain distance from the inner peripheral surface of the housing 33, the compression operation is not performed.

  Therefore, when the rotation shaft 21 rotates forward, in the first compression chamber 31 having a relatively large internal volume, the refrigerant gas flowing in from the first suction port 63 is compressed by the first roller 37 and discharged from the first discharge port 65. Thus, the compression operation is not performed in the second compression chamber 32 having a relatively small internal volume, and as a result, the rotary compressor operates with an increased compression capacity.

  Referring to FIGS. 7 and 8, when the rotating shaft 21 rotates in the reverse direction (clockwise in FIGS. 7 and 8), the clutch pin 80 protruding from the rotating shaft 21 rotates along the slot 53 while rotating the slot 53. The first and second eccentric bushes 51 and 52 are engaged with the rotary shaft 21 by being locked to the second end portion 53b.

  Thus, when the clutch pin 80 rotates with the second end 53b of the slot 53 being engaged, the second eccentric bushing 52 is offset to the maximum from the center of the rotating shaft 21, as shown in FIG. Since the second roller 38 rotates in a state where it touches the inner peripheral surface of the housing 33 in the second compression chamber 32, the second compression chamber 32 performs a compression operation.

  On the other hand, as shown in FIG. 8, the first eccentric bush 51 that is eccentric to the opposite side of the second eccentric bush 52 is switched to a position that is concentric with the center of the rotating shaft 21, and the first roller 37 is subjected to the first compression. Since the chamber 31 is idly rotated away from the inner peripheral surface of the housing 33 by a predetermined distance, the compression operation is not performed.

  Therefore, when the rotating shaft 21 rotates in the reverse direction, in the second compression chamber 32 having a relatively small internal volume, the refrigerant gas flowing in from the second suction port 64 is compressed by the second roller 38 and discharged from the second discharge port 66. Thus, the compression operation is not performed in the first compression chamber 31 having a relatively large internal volume, and the rotary compressor operates with a reduced compression capacity.

  As described above, the rotation of the rotary shaft 21, the first and second eccentric bushes 51 and 52, and the first and second rollers 37 and 38 causes the clutch pin 80 coupled to the clutch hole 85 to have a minute amount. As vibration is transmitted, the clutch pin 80 repeatedly collides with the first and second ends 53a and 53b of the slot 53, and the continuous repetition of such movement causes the clutch pin 80 to return to its original position in the clutch hole 85. Although the displacement variable rotary compressor of the present invention has a structure in which the fixing pin 90 firmly fixes the side surface of the clutch pin 80, the clutch pin 80 has the clutch hole 85. The combined state can be maintained without deviating from the original position.

It is a longitudinal section showing an outline of an internal structure of a capacity variable rotary compressor concerning the present invention. It is a disassembled perspective view which shows the state from which the eccentric apparatus shown in FIG. 1 is cut | disconnected from the rotating shaft. FIG. 3 is a partially enlarged view of FIG. 2 showing a structure in which a clutch pin is coupled to a rotating shaft. FIG. 3 is a partially enlarged view of FIG. 2 showing a structure in which a clutch pin is coupled to a rotating shaft. It is sectional drawing which shows the 1st compression chamber in which a rotating shaft rotates forward and a compression operation is performed by the eccentric apparatus shown in FIG. FIG. 6 corresponds to FIG. 5, and is a cross-sectional view showing a second compression chamber in which a rotation shaft rotates forward and a compression operation is not performed by the eccentric device shown in FIG. 2. It is sectional drawing which shows the 2nd compression chamber in which a rotating shaft reversely rotates and a compression action is performed by the eccentric apparatus shown in FIG. FIG. 9 corresponds to FIG. 7, and is a cross-sectional view showing a first compression chamber in which a rotation shaft is reversely rotated and no compression action is performed by the eccentric device shown in FIG. 2.

Explanation of symbols

21 Rotating shaft 31 First compression chamber 32 Second compression chamber 40 Eccentric device 41 First eccentric cam 42 Second eccentric cam 51 First eccentric bush 52 Second eccentric bush 80 Clutch pin 85 Clutch hole 90 Fixed pin 95 Fixed hole

Claims (10)

First and second compression chambers having different internal volumes;
A rotating shaft that passes through the first and second compression chambers;
First and second eccentric bushes disposed on the outer peripheral surface of the rotating shaft;
A slot formed between the first and second eccentric bushes;
A clutch pin protruding from the rotating shaft and disposed in the slot;
A fixing pin that is coupled to a side surface of the clutch pin inside the rotating shaft and firmly fixes the clutch pin;
A variable displacement rotary compressor comprising:   The rotation shaft includes a clutch hole formed in a radial direction and a fixing hole formed in a circumferential direction and communicating with the clutch hole, and the clutch pin and the fixing pin are inserted into the clutch hole and the fixing hole, respectively. The variable displacement rotary compressor according to claim 1, wherein the fixed pin is coupled to a side surface of the clutch pin.   The groove according to claim 2, wherein a groove having a constant width is formed in a rear stage portion of the clutch pin, and a rear end portion of the fixed pin is fitted into the groove inside the rotating shaft. Capacity variable rotary compressor.   The said clutch hole and the said fixing hole are formed so that it may orthogonally cross in the inside of the said rotating shaft, The said fixing pin fixes the said clutch pin more firmly, The said pin is characterized by the above-mentioned. Capacity variable rotary compressor.   The variable displacement rotary compressor according to claim 2, wherein the clutch pin has a size larger than the clutch hole and is coupled to the clutch hole by a press-fitting method.   The variable displacement rotary compressor according to claim 2, wherein a thread is formed on the fixing pin and the fixing hole, and the fixing pin is screwed to the fixing hole. First and second compression chambers having different internal volumes and compressing gas;
A rotating shaft that passes through each of the plurality of compression chambers;
A clutch pin disposed on the rotating shaft and configured to operate one of the first and second compression chambers by rotation of the rotating shaft;
A fixed pin that is disposed on the rotating shaft and is coupled to the clutch pin to prevent the clutch pin from being detached from the rotating shaft;
A variable displacement rotary compressor comprising: The rotation axis is
A clutch hole formed in a radial direction and accommodating the clutch pin;
A fixing hole formed in a circumferential direction and accommodating the fixing pin;
The variable displacement rotary compressor according to claim 7, comprising:   The fixing hole communicates with the clutch hole, and the fixing pin accommodated in the fixing hole comes into contact with the clutch pin accommodated in the clutch hole, thereby preventing the clutch pin from being detached from the rotating shaft. The capacity variable rotary compressor according to claim 8, wherein   The fixed pin has a coupling portion that is coupled to the clutch pin to prevent the clutch pin from moving with respect to the rotation shaft, and the clutch pin includes a housing portion that houses the coupling portion of the stationary pin. The variable displacement rotary compressor according to claim 7, comprising:

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